Control Module Communication Bus OFF - Vehicle Stability Control System (from 12/2010)

BRAKE CONTROL: VEHICLE STABILITY CONTROL SYSTEM: U0073/94,U0100/65,U0123/62,U0124/95,U0126/63: Control Module Communication Bus OFF
U0126/63 - Lost Communication with Steering Angle Sensor Module

DESCRIPTION

The skid control ECU receives signals from the ECM, steering angle sensor, and yaw rate and acceleration sensor via the CAN communication system.





INSPECTION PROCEDURE

PROCEDURE

1. CHECK HARNESS AND CONNECTOR (MOMENTARY INTERRUPTION)

(a) Using the Techstream, check for any momentary interruption in the wire harness and connector corresponding to a DTC Check For Intermittent Problems.

ABS/VSC/TRAC





OK:

There are no momentary interruptions.

HINT
Perform the above inspection before removing the sensor and connector.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

2. RECONFIRM DTC

(a) Turn the ignition switch off.

(b) Record the output DTCs (for ABS, VSC system, and/or CAN communication system).

HINT
If CAN communication system DTCs and the relevant sensor DTCs are output simultaneously, troubleshoot the relevant sensor DTCs (for ABS and/or VSC system) after the CAN communication system returns to normal.

NEXT -- INSPECT CAN COMMUNICATION SYSTEM Initial Inspection and Diagnostic Overview

3. REPAIR OR REPLACE HARNESS OR CONNECTOR

(a) Turn the ignition switch off.

(b) Repair or replace the harness and connector.

(c) Check for any momentary interruption between the skid control ECU and each sensor or ECM Check For Intermittent Problems.

(d) Check that there is no momentary interruption.

NEXT -- Continue to next step.

4. RECONFIRM DTC

(a) Turn the ignition switch off.

(b) Clear the DTC DTC Check / Clear (from 12/2010).

(c) Start the engine.

(d) Drive the vehicle and turn the steering wheel to the right and left at a speed of 15 km/h (9 mph) or more.

(e) Check that no CAN communication system DTC is output Reading and Clearing Diagnostic Trouble Codes.

(f) If ABS and VSC DTCs are output, record them.

Result:





HINT
The CAN communication system must be normal when performing troubleshooting for each sensor DTC (for ABS and/or VSC system).

C -- END

B -- REPAIR CIRCUIT INDICATED BY OUTPUT CODE Diagnostic Trouble Code Chart (from 12/2010)

A -- INSPECT CAN COMMUNICATION SYSTEM Initial Inspection and Diagnostic Overview